Apply a subtle semi-transparent border to images in the media list table to avoid the "white on white (like a polar bear in Antarctica)" problem.

Props ericlewis.
Fixes #15860.

Built from https://develop.svn.wordpress.org/trunk@28842


git-svn-id: http://core.svn.wordpress.org/trunk@28646 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/common-rtl.css

@@ -1653,6 +1653,7 @@ td.media-icon {
 }
 
 td.media-icon img {
+	border: 1px solid rgba(0, 0, 0, 0.07);
 	max-width: 80px;
 	max-height: 60px;
 }

wp-admin/css/common.css

@@ -1653,6 +1653,7 @@ td.media-icon {
 }
 
 td.media-icon img {
+	border: 1px solid rgba(0, 0, 0, 0.07);
 	max-width: 80px;
 	max-height: 60px;
 }